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[mirror_ubuntu-bionic-kernel.git] / arch / sh / kernel / process_64.c
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1da177e4 1/*
5a4f7c66 2 * arch/sh/kernel/process_64.c
1da177e4 3 *
5a4f7c66 4 * This file handles the architecture-dependent parts of process handling..
1da177e4
LT		 5 *
6 * Copyright (C) 2000, 2001 Paolo Alberelli
5a4f7c66 7 * Copyright (C) 2003 - 2007 Paul Mundt
1da177e4
LT		 8 * Copyright (C) 2003, 2004 Richard Curnow
9 *
10 * Started from SH3/4 version:
11 * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
12 *
13 * In turn started from i386 version:
14 * Copyright (C) 1995 Linus Torvalds
15 *
5a4f7c66
PM		 16 * This file is subject to the terms and conditions of the GNU General Public
17 * License. See the file "COPYING" in the main directory of this archive
18 * for more details.
1da177e4 19 */
1da177e4 20#include <linux/mm.h>
78d98277 21#include <linux/fs.h>
1da177e4 22#include <linux/ptrace.h>
1da177e4 23#include <linux/reboot.h>
5a0e3ad6 24#include <linux/slab.h>
1da177e4 25#include <linux/init.h>
821278a7 26#include <linux/module.h>
a7aa92d1 27#include <linux/io.h>
b17b0153 28#include <linux/sched/debug.h>
fa43972f 29#include <asm/syscalls.h>
7c0f6ba6 30#include <linux/uaccess.h>
1da177e4 31#include <asm/pgtable.h>
df0fb256 32#include <asm/mmu_context.h>
50387b3e 33#include <asm/fpu.h>
e839ca52 34#include <asm/switch_to.h>
1da177e4
LT		 35
36struct task_struct *last_task_used_math = NULL;
3a9485da 37struct pt_regs fake_swapper_regs = { 0, };
1da177e4 38
fbb82b03 39void show_regs(struct pt_regs *regs)
1da177e4
LT		 40{
41 unsigned long long ah, al, bh, bl, ch, cl;
42
43 printk("\n");
a43cb95d 44 show_regs_print_info(KERN_DEFAULT);
1da177e4
LT		 45
46 ah = (regs->pc) >> 32;
47 al = (regs->pc) & 0xffffffff;
48 bh = (regs->regs[18]) >> 32;
49 bl = (regs->regs[18]) & 0xffffffff;
50 ch = (regs->regs[15]) >> 32;
51 cl = (regs->regs[15]) & 0xffffffff;
52 printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n",
53 ah, al, bh, bl, ch, cl);
54
55 ah = (regs->sr) >> 32;
56 al = (regs->sr) & 0xffffffff;
57 asm volatile ("getcon " __TEA ", %0" : "=r" (bh));
58 asm volatile ("getcon " __TEA ", %0" : "=r" (bl));
59 bh = (bh) >> 32;
60 bl = (bl) & 0xffffffff;
61 asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch));
62 asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl));
63 ch = (ch) >> 32;
64 cl = (cl) & 0xffffffff;
65 printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",
66 ah, al, bh, bl, ch, cl);
67
68 ah = (regs->regs[0]) >> 32;
69 al = (regs->regs[0]) & 0xffffffff;
70 bh = (regs->regs[1]) >> 32;
71 bl = (regs->regs[1]) & 0xffffffff;
72 ch = (regs->regs[2]) >> 32;
73 cl = (regs->regs[2]) & 0xffffffff;
74 printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n",
75 ah, al, bh, bl, ch, cl);
76
77 ah = (regs->regs[3]) >> 32;
78 al = (regs->regs[3]) & 0xffffffff;
79 bh = (regs->regs[4]) >> 32;
80 bl = (regs->regs[4]) & 0xffffffff;
81 ch = (regs->regs[5]) >> 32;
82 cl = (regs->regs[5]) & 0xffffffff;
83 printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n",
84 ah, al, bh, bl, ch, cl);
85
86 ah = (regs->regs[6]) >> 32;
87 al = (regs->regs[6]) & 0xffffffff;
88 bh = (regs->regs[7]) >> 32;
89 bl = (regs->regs[7]) & 0xffffffff;
90 ch = (regs->regs[8]) >> 32;
91 cl = (regs->regs[8]) & 0xffffffff;
92 printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n",
93 ah, al, bh, bl, ch, cl);
94
95 ah = (regs->regs[9]) >> 32;
96 al = (regs->regs[9]) & 0xffffffff;
97 bh = (regs->regs[10]) >> 32;
98 bl = (regs->regs[10]) & 0xffffffff;
99 ch = (regs->regs[11]) >> 32;
100 cl = (regs->regs[11]) & 0xffffffff;
101 printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",
102 ah, al, bh, bl, ch, cl);
103
104 ah = (regs->regs[12]) >> 32;
105 al = (regs->regs[12]) & 0xffffffff;
106 bh = (regs->regs[13]) >> 32;
107 bl = (regs->regs[13]) & 0xffffffff;
108 ch = (regs->regs[14]) >> 32;
109 cl = (regs->regs[14]) & 0xffffffff;
110 printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n",
111 ah, al, bh, bl, ch, cl);
112
113 ah = (regs->regs[16]) >> 32;
114 al = (regs->regs[16]) & 0xffffffff;
115 bh = (regs->regs[17]) >> 32;
116 bl = (regs->regs[17]) & 0xffffffff;
117 ch = (regs->regs[19]) >> 32;
118 cl = (regs->regs[19]) & 0xffffffff;
119 printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n",
120 ah, al, bh, bl, ch, cl);
121
122 ah = (regs->regs[20]) >> 32;
123 al = (regs->regs[20]) & 0xffffffff;
124 bh = (regs->regs[21]) >> 32;
125 bl = (regs->regs[21]) & 0xffffffff;
126 ch = (regs->regs[22]) >> 32;
127 cl = (regs->regs[22]) & 0xffffffff;
128 printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n",
129 ah, al, bh, bl, ch, cl);
130
131 ah = (regs->regs[23]) >> 32;
132 al = (regs->regs[23]) & 0xffffffff;
133 bh = (regs->regs[24]) >> 32;
134 bl = (regs->regs[24]) & 0xffffffff;
135 ch = (regs->regs[25]) >> 32;
136 cl = (regs->regs[25]) & 0xffffffff;
137 printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n",
138 ah, al, bh, bl, ch, cl);
139
140 ah = (regs->regs[26]) >> 32;
141 al = (regs->regs[26]) & 0xffffffff;
142 bh = (regs->regs[27]) >> 32;
143 bl = (regs->regs[27]) & 0xffffffff;
144 ch = (regs->regs[28]) >> 32;
145 cl = (regs->regs[28]) & 0xffffffff;
146 printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n",
147 ah, al, bh, bl, ch, cl);
148
149 ah = (regs->regs[29]) >> 32;
150 al = (regs->regs[29]) & 0xffffffff;
151 bh = (regs->regs[30]) >> 32;
152 bl = (regs->regs[30]) & 0xffffffff;
153 ch = (regs->regs[31]) >> 32;
154 cl = (regs->regs[31]) & 0xffffffff;
155 printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n",
156 ah, al, bh, bl, ch, cl);
157
158 ah = (regs->regs[32]) >> 32;
159 al = (regs->regs[32]) & 0xffffffff;
160 bh = (regs->regs[33]) >> 32;
161 bl = (regs->regs[33]) & 0xffffffff;
162 ch = (regs->regs[34]) >> 32;
163 cl = (regs->regs[34]) & 0xffffffff;
164 printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n",
165 ah, al, bh, bl, ch, cl);
166
167 ah = (regs->regs[35]) >> 32;
168 al = (regs->regs[35]) & 0xffffffff;
169 bh = (regs->regs[36]) >> 32;
170 bl = (regs->regs[36]) & 0xffffffff;
171 ch = (regs->regs[37]) >> 32;
172 cl = (regs->regs[37]) & 0xffffffff;
173 printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n",
174 ah, al, bh, bl, ch, cl);
175
176 ah = (regs->regs[38]) >> 32;
177 al = (regs->regs[38]) & 0xffffffff;
178 bh = (regs->regs[39]) >> 32;
179 bl = (regs->regs[39]) & 0xffffffff;
180 ch = (regs->regs[40]) >> 32;
181 cl = (regs->regs[40]) & 0xffffffff;
182 printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n",
183 ah, al, bh, bl, ch, cl);
184
185 ah = (regs->regs[41]) >> 32;
186 al = (regs->regs[41]) & 0xffffffff;
187 bh = (regs->regs[42]) >> 32;
188 bl = (regs->regs[42]) & 0xffffffff;
189 ch = (regs->regs[43]) >> 32;
190 cl = (regs->regs[43]) & 0xffffffff;
191 printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n",
192 ah, al, bh, bl, ch, cl);
193
194 ah = (regs->regs[44]) >> 32;
195 al = (regs->regs[44]) & 0xffffffff;
196 bh = (regs->regs[45]) >> 32;
197 bl = (regs->regs[45]) & 0xffffffff;
198 ch = (regs->regs[46]) >> 32;
199 cl = (regs->regs[46]) & 0xffffffff;
200 printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n",
201 ah, al, bh, bl, ch, cl);
202
203 ah = (regs->regs[47]) >> 32;
204 al = (regs->regs[47]) & 0xffffffff;
205 bh = (regs->regs[48]) >> 32;
206 bl = (regs->regs[48]) & 0xffffffff;
207 ch = (regs->regs[49]) >> 32;
208 cl = (regs->regs[49]) & 0xffffffff;
209 printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n",
210 ah, al, bh, bl, ch, cl);
211
212 ah = (regs->regs[50]) >> 32;
213 al = (regs->regs[50]) & 0xffffffff;
214 bh = (regs->regs[51]) >> 32;
215 bl = (regs->regs[51]) & 0xffffffff;
216 ch = (regs->regs[52]) >> 32;
217 cl = (regs->regs[52]) & 0xffffffff;
218 printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n",
219 ah, al, bh, bl, ch, cl);
220
221 ah = (regs->regs[53]) >> 32;
222 al = (regs->regs[53]) & 0xffffffff;
223 bh = (regs->regs[54]) >> 32;
224 bl = (regs->regs[54]) & 0xffffffff;
225 ch = (regs->regs[55]) >> 32;
226 cl = (regs->regs[55]) & 0xffffffff;
227 printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n",
228 ah, al, bh, bl, ch, cl);
229
230 ah = (regs->regs[56]) >> 32;
231 al = (regs->regs[56]) & 0xffffffff;
232 bh = (regs->regs[57]) >> 32;
233 bl = (regs->regs[57]) & 0xffffffff;
234 ch = (regs->regs[58]) >> 32;
235 cl = (regs->regs[58]) & 0xffffffff;
236 printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n",
237 ah, al, bh, bl, ch, cl);
238
239 ah = (regs->regs[59]) >> 32;
240 al = (regs->regs[59]) & 0xffffffff;
241 bh = (regs->regs[60]) >> 32;
242 bl = (regs->regs[60]) & 0xffffffff;
243 ch = (regs->regs[61]) >> 32;
244 cl = (regs->regs[61]) & 0xffffffff;
245 printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n",
246 ah, al, bh, bl, ch, cl);
247
248 ah = (regs->regs[62]) >> 32;
249 al = (regs->regs[62]) & 0xffffffff;
250 bh = (regs->tregs[0]) >> 32;
251 bl = (regs->tregs[0]) & 0xffffffff;
252 ch = (regs->tregs[1]) >> 32;
253 cl = (regs->tregs[1]) & 0xffffffff;
254 printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n",
255 ah, al, bh, bl, ch, cl);
256
257 ah = (regs->tregs[2]) >> 32;
258 al = (regs->tregs[2]) & 0xffffffff;
259 bh = (regs->tregs[3]) >> 32;
260 bl = (regs->tregs[3]) & 0xffffffff;
261 ch = (regs->tregs[4]) >> 32;
262 cl = (regs->tregs[4]) & 0xffffffff;
263 printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n",
264 ah, al, bh, bl, ch, cl);
265
266 ah = (regs->tregs[5]) >> 32;
267 al = (regs->tregs[5]) & 0xffffffff;
268 bh = (regs->tregs[6]) >> 32;
269 bl = (regs->tregs[6]) & 0xffffffff;
270 ch = (regs->tregs[7]) >> 32;
271 cl = (regs->tregs[7]) & 0xffffffff;
272 printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n",
273 ah, al, bh, bl, ch, cl);
274
275 /*
276 * If we're in kernel mode, dump the stack too..
277 */
278 if (!user_mode(regs)) {
279 void show_stack(struct task_struct *tsk, unsigned long *sp);
280 unsigned long sp = regs->regs[15] & 0xffffffff;
281 struct task_struct *tsk = get_current();
282
283 tsk->thread.kregs = regs;
284
285 show_stack(tsk, (unsigned long *)sp);
286 }
287}
288
1da177e4
LT		 289/*
290 * Free current thread data structures etc..
291 */
e6464694 292void exit_thread(struct task_struct *tsk)
1da177e4 293{
a23ba435
PM		 294 /*
295 * See arch/sparc/kernel/process.c for the precedent for doing
296 * this -- RPC.
297 *
298 * The SH-5 FPU save/restore approach relies on
299 * last_task_used_math pointing to a live task_struct. When
300 * another task tries to use the FPU for the 1st time, the FPUDIS
301 * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the
302 * existing FPU state to the FP regs field within
303 * last_task_used_math before re-loading the new task's FPU state
304 * (or initialising it if the FPU has been used before). So if
305 * last_task_used_math is stale, and its page has already been
306 * re-allocated for another use, the consequences are rather
307 * grim. Unless we null it here, there is no other path through
308 * which it would get safely nulled.
309 */
1da177e4 310#ifdef CONFIG_SH_FPU
e6464694 311 if (last_task_used_math == tsk)
1da177e4 312 last_task_used_math = NULL;
1da177e4
LT		 313#endif
314}
315
316void flush_thread(void)
317{
318
221af7f8 319 /* Called by fs/exec.c (setup_new_exec) to remove traces of a
1da177e4
LT		 320 * previously running executable. */
321#ifdef CONFIG_SH_FPU
322 if (last_task_used_math == current) {
323 last_task_used_math = NULL;
324 }
325 /* Force FPU state to be reinitialised after exec */
326 clear_used_math();
327#endif
328
329 /* if we are a kernel thread, about to change to user thread,
330 * update kreg
331 */
332 if(current->thread.kregs==&fake_swapper_regs) {
333 current->thread.kregs =
334 ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1);
335 current->thread.uregs = current->thread.kregs;
336 }
337}
338
339void release_thread(struct task_struct *dead_task)
340{
341 /* do nothing */
342}
343
344/* Fill in the fpu structure for a core dump.. */
345int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
346{
347#ifdef CONFIG_SH_FPU
348 int fpvalid;
349 struct task_struct *tsk = current;
350
351 fpvalid = !!tsk_used_math(tsk);
352 if (fpvalid) {
353 if (current == last_task_used_math) {
600ee240 354 enable_fpu();
61cc7b0a 355 save_fpu(tsk);
600ee240 356 disable_fpu();
1da177e4
LT		 357 last_task_used_math = 0;
358 regs->sr |= SR_FD;
359 }
360
3ef2932b 361 memcpy(fpu, &tsk->thread.xstate->hardfpu, sizeof(*fpu));
1da177e4
LT		 362 }
363
364 return fpvalid;
365#else
366 return 0; /* Task didn't use the fpu at all. */
367#endif
368}
4c978ca3 369EXPORT_SYMBOL(dump_fpu);
1da177e4
LT		 370
371asmlinkage void ret_from_fork(void);
7147e215 372asmlinkage void ret_from_kernel_thread(void);
1da177e4 373
6f2c55b8 374int copy_thread(unsigned long clone_flags, unsigned long usp,
afa86fc4 375 unsigned long arg, struct task_struct *p)
1da177e4 376{
8d28df81 377 struct pt_regs *childregs;
1da177e4
LT		 378
379#ifdef CONFIG_SH_FPU
7147e215
AV		 380 /* can't happen for a kernel thread */
381 if (last_task_used_math == current) {
600ee240 382 enable_fpu();
61cc7b0a 383 save_fpu(current);
600ee240 384 disable_fpu();
1da177e4 385 last_task_used_math = NULL;
0ad9513d 386 current_pt_regs()->sr |= SR_FD;
1da177e4
LT		 387 }
388#endif
389 /* Copy from sh version */
ee8c1dd4 390 childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1;
7147e215 391 p->thread.sp = (unsigned long) childregs;
1da177e4 392
7147e215
AV		 393 if (unlikely(p->flags & PF_KTHREAD)) {
394 memset(childregs, 0, sizeof(struct pt_regs));
395 childregs->regs[2] = (unsigned long)arg;
42b43341 396 childregs->regs[3] = (unsigned long)usp;
7147e215
AV		 397 childregs->sr = (1 << 30); /* not user_mode */
398 childregs->sr |= SR_FD; /* Invalidate FPU flag */
399 p->thread.pc = (unsigned long) ret_from_kernel_thread;
400 return 0;
401 }
0ad9513d 402 *childregs = *current_pt_regs();
1da177e4 403
c7914834
PM		 404 /*
405 * Sign extend the edited stack.
406 * Note that thread.pc and thread.pc will stay
407 * 32-bit wide and context switch must take care
408 * of NEFF sign extension.
409 */
0ad9513d
AV		 410 if (usp)
411 childregs->regs[15] = neff_sign_extend(usp);
7147e215 412 p->thread.uregs = childregs;
1da177e4
LT		 413
414 childregs->regs[9] = 0; /* Set return value for child */
415 childregs->sr |= SR_FD; /* Invalidate FPU flag */
416
1da177e4
LT		 417 p->thread.pc = (unsigned long) ret_from_fork;
418
1da177e4
LT		 419 return 0;
420}
421
43081e18 422#ifdef CONFIG_FRAME_POINTER
1da177e4
LT		 423static int in_sh64_switch_to(unsigned long pc)
424{
425 extern char __sh64_switch_to_end;
426 /* For a sleeping task, the PC is somewhere in the middle of the function,
427 so we don't have to worry about masking the LSB off */
428 return (pc >= (unsigned long) sh64_switch_to) &&
429 (pc < (unsigned long) &__sh64_switch_to_end);
430}
43081e18 431#endif
1da177e4
LT		 432
433unsigned long get_wchan(struct task_struct *p)
434{
1da177e4
LT		 435 unsigned long pc;
436
437 if (!p || p == current || p->state == TASK_RUNNING)
438 return 0;
439
440 /*
441 * The same comment as on the Alpha applies here, too ...
442 */
443 pc = thread_saved_pc(p);
444
445#ifdef CONFIG_FRAME_POINTER
446 if (in_sh64_switch_to(pc)) {
43081e18
PM		 447 unsigned long schedule_fp;
448 unsigned long sh64_switch_to_fp;
449 unsigned long schedule_caller_pc;
450
1da177e4
LT		 451 sh64_switch_to_fp = (long) p->thread.sp;
452 /* r14 is saved at offset 4 in the sh64_switch_to frame */
453 schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4);
454
455 /* and the caller of 'schedule' is (currently!) saved at offset 24
456 in the frame of schedule (from disasm) */
457 schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24);
458 return schedule_caller_pc;
459 }
460#endif
461 return pc;
462}
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